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Commit | Line | Data |
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83922c2d JM |
1 | /* |
2 | * BSS table | |
2c09af30 | 3 | * Copyright (c) 2009-2012, Jouni Malinen <j@w1.fi> |
83922c2d | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
83922c2d JM |
7 | */ |
8 | ||
9 | #include "utils/includes.h" | |
10 | ||
11 | #include "utils/common.h" | |
12 | #include "utils/eloop.h" | |
13 | #include "common/ieee802_11_defs.h" | |
14 | #include "drivers/driver.h" | |
15 | #include "wpa_supplicant_i.h" | |
c9c38b09 | 16 | #include "config.h" |
83922c2d | 17 | #include "notify.h" |
d1f9c410 | 18 | #include "scan.h" |
83922c2d JM |
19 | #include "bss.h" |
20 | ||
21 | ||
83922c2d JM |
22 | /** |
23 | * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds | |
24 | */ | |
25 | #define WPA_BSS_EXPIRATION_PERIOD 10 | |
26 | ||
158c6c74 WS |
27 | #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0) |
28 | #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1) | |
29 | #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2) | |
30 | #define WPA_BSS_MODE_CHANGED_FLAG BIT(3) | |
31 | #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4) | |
32 | #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5) | |
33 | #define WPA_BSS_WPS_CHANGED_FLAG BIT(6) | |
34 | #define WPA_BSS_RATES_CHANGED_FLAG BIT(7) | |
7899e2f4 | 35 | #define WPA_BSS_IES_CHANGED_FLAG BIT(8) |
158c6c74 | 36 | |
83922c2d | 37 | |
c739d7e9 JM |
38 | static void wpa_bss_set_hessid(struct wpa_bss *bss) |
39 | { | |
40 | #ifdef CONFIG_INTERWORKING | |
41 | const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING); | |
42 | if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) { | |
43 | os_memset(bss->hessid, 0, ETH_ALEN); | |
44 | return; | |
45 | } | |
46 | if (ie[1] == 7) | |
47 | os_memcpy(bss->hessid, ie + 3, ETH_ALEN); | |
48 | else | |
49 | os_memcpy(bss->hessid, ie + 5, ETH_ALEN); | |
50 | #endif /* CONFIG_INTERWORKING */ | |
51 | } | |
52 | ||
53 | ||
2c09af30 JM |
54 | /** |
55 | * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry | |
56 | * Returns: Allocated ANQP data structure or %NULL on failure | |
57 | * | |
58 | * The allocated ANQP data structure has its users count set to 1. It may be | |
59 | * shared by multiple BSS entries and each shared entry is freed with | |
60 | * wpa_bss_anqp_free(). | |
61 | */ | |
476aed35 JM |
62 | struct wpa_bss_anqp * wpa_bss_anqp_alloc(void) |
63 | { | |
64 | struct wpa_bss_anqp *anqp; | |
65 | anqp = os_zalloc(sizeof(*anqp)); | |
66 | if (anqp == NULL) | |
67 | return NULL; | |
68 | anqp->users = 1; | |
69 | return anqp; | |
70 | } | |
71 | ||
72 | ||
2c09af30 JM |
73 | /** |
74 | * wpa_bss_anqp_clone - Clone an ANQP data structure | |
75 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() | |
76 | * Returns: Cloned ANQP data structure or %NULL on failure | |
77 | */ | |
485e3a92 JM |
78 | static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp) |
79 | { | |
80 | struct wpa_bss_anqp *n; | |
81 | ||
82 | n = os_zalloc(sizeof(*n)); | |
83 | if (n == NULL) | |
84 | return NULL; | |
85 | ||
86 | #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f) | |
87 | #ifdef CONFIG_INTERWORKING | |
88 | ANQP_DUP(venue_name); | |
89 | ANQP_DUP(network_auth_type); | |
90 | ANQP_DUP(roaming_consortium); | |
91 | ANQP_DUP(ip_addr_type_availability); | |
92 | ANQP_DUP(nai_realm); | |
93 | ANQP_DUP(anqp_3gpp); | |
94 | ANQP_DUP(domain_name); | |
95 | #endif /* CONFIG_INTERWORKING */ | |
96 | #ifdef CONFIG_HS20 | |
97 | ANQP_DUP(hs20_operator_friendly_name); | |
98 | ANQP_DUP(hs20_wan_metrics); | |
99 | ANQP_DUP(hs20_connection_capability); | |
100 | ANQP_DUP(hs20_operating_class); | |
1d2215fc | 101 | ANQP_DUP(hs20_osu_providers_list); |
485e3a92 JM |
102 | #endif /* CONFIG_HS20 */ |
103 | #undef ANQP_DUP | |
104 | ||
105 | return n; | |
106 | } | |
107 | ||
108 | ||
2c09af30 JM |
109 | /** |
110 | * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry | |
111 | * @bss: BSS entry | |
112 | * Returns: 0 on success, -1 on failure | |
113 | * | |
114 | * This function ensures the specific BSS entry has an ANQP data structure that | |
115 | * is not shared with any other BSS entry. | |
116 | */ | |
485e3a92 JM |
117 | int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss) |
118 | { | |
119 | struct wpa_bss_anqp *anqp; | |
120 | ||
121 | if (bss->anqp && bss->anqp->users > 1) { | |
122 | /* allocated, but shared - clone an unshared copy */ | |
123 | anqp = wpa_bss_anqp_clone(bss->anqp); | |
124 | if (anqp == NULL) | |
125 | return -1; | |
126 | anqp->users = 1; | |
127 | bss->anqp->users--; | |
128 | bss->anqp = anqp; | |
129 | return 0; | |
130 | } | |
131 | ||
132 | if (bss->anqp) | |
133 | return 0; /* already allocated and not shared */ | |
134 | ||
135 | /* not allocated - allocate a new storage area */ | |
136 | bss->anqp = wpa_bss_anqp_alloc(); | |
137 | return bss->anqp ? 0 : -1; | |
138 | } | |
139 | ||
140 | ||
2c09af30 JM |
141 | /** |
142 | * wpa_bss_anqp_free - Free an ANQP data structure | |
143 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone() | |
144 | */ | |
476aed35 JM |
145 | static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp) |
146 | { | |
147 | if (anqp == NULL) | |
148 | return; | |
149 | ||
150 | anqp->users--; | |
151 | if (anqp->users > 0) { | |
152 | /* Another BSS entry holds a pointer to this ANQP info */ | |
153 | return; | |
154 | } | |
155 | ||
156 | #ifdef CONFIG_INTERWORKING | |
157 | wpabuf_free(anqp->venue_name); | |
158 | wpabuf_free(anqp->network_auth_type); | |
159 | wpabuf_free(anqp->roaming_consortium); | |
160 | wpabuf_free(anqp->ip_addr_type_availability); | |
161 | wpabuf_free(anqp->nai_realm); | |
162 | wpabuf_free(anqp->anqp_3gpp); | |
163 | wpabuf_free(anqp->domain_name); | |
164 | #endif /* CONFIG_INTERWORKING */ | |
165 | #ifdef CONFIG_HS20 | |
166 | wpabuf_free(anqp->hs20_operator_friendly_name); | |
167 | wpabuf_free(anqp->hs20_wan_metrics); | |
168 | wpabuf_free(anqp->hs20_connection_capability); | |
169 | wpabuf_free(anqp->hs20_operating_class); | |
1d2215fc | 170 | wpabuf_free(anqp->hs20_osu_providers_list); |
476aed35 JM |
171 | #endif /* CONFIG_HS20 */ |
172 | ||
173 | os_free(anqp); | |
174 | } | |
175 | ||
176 | ||
a7f5271d JM |
177 | static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s, |
178 | struct wpa_bss *old_bss, | |
179 | struct wpa_bss *new_bss) | |
180 | { | |
181 | struct wpa_radio_work *work; | |
182 | struct wpa_connect_work *cwork; | |
183 | ||
184 | work = radio_work_pending(wpa_s, "sme-connect"); | |
185 | if (!work) | |
186 | work = radio_work_pending(wpa_s, "connect"); | |
187 | if (!work) | |
188 | return; | |
189 | ||
190 | cwork = work->ctx; | |
191 | if (cwork->bss != old_bss) | |
192 | return; | |
193 | ||
194 | wpa_printf(MSG_DEBUG, | |
195 | "Update BSS pointer for the pending connect radio work"); | |
196 | cwork->bss = new_bss; | |
197 | if (!new_bss) | |
198 | cwork->bss_removed = 1; | |
199 | } | |
200 | ||
201 | ||
a6b71f72 PS |
202 | static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
203 | const char *reason) | |
83922c2d | 204 | { |
a297201d JM |
205 | if (wpa_s->last_scan_res) { |
206 | unsigned int i; | |
207 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
208 | if (wpa_s->last_scan_res[i] == bss) { | |
209 | os_memmove(&wpa_s->last_scan_res[i], | |
210 | &wpa_s->last_scan_res[i + 1], | |
211 | (wpa_s->last_scan_res_used - i - 1) | |
212 | * sizeof(struct wpa_bss *)); | |
213 | wpa_s->last_scan_res_used--; | |
214 | break; | |
215 | } | |
216 | } | |
217 | } | |
a7f5271d | 218 | wpa_bss_update_pending_connect(wpa_s, bss, NULL); |
83922c2d | 219 | dl_list_del(&bss->list); |
d4bf8f13 | 220 | dl_list_del(&bss->list_id); |
83922c2d | 221 | wpa_s->num_bss--; |
f049052b | 222 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR |
a6b71f72 PS |
223 | " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid), |
224 | wpa_ssid_txt(bss->ssid, bss->ssid_len), reason); | |
f0d126d3 | 225 | wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); |
476aed35 | 226 | wpa_bss_anqp_free(bss->anqp); |
83922c2d JM |
227 | os_free(bss); |
228 | } | |
229 | ||
230 | ||
2c09af30 JM |
231 | /** |
232 | * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID | |
233 | * @wpa_s: Pointer to wpa_supplicant data | |
234 | * @bssid: BSSID | |
235 | * @ssid: SSID | |
236 | * @ssid_len: Length of @ssid | |
237 | * Returns: Pointer to the BSS entry or %NULL if not found | |
238 | */ | |
59f2caa9 JM |
239 | struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, |
240 | const u8 *ssid, size_t ssid_len) | |
83922c2d JM |
241 | { |
242 | struct wpa_bss *bss; | |
d445a5cd JM |
243 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
244 | return NULL; | |
83922c2d JM |
245 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
246 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
247 | bss->ssid_len == ssid_len && | |
248 | os_memcmp(bss->ssid, ssid, ssid_len) == 0) | |
249 | return bss; | |
250 | } | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | ||
acb69cec | 255 | static void calculate_update_time(const struct os_reltime *fetch_time, |
4342326f | 256 | unsigned int age_ms, |
acb69cec | 257 | struct os_reltime *update_time) |
83922c2d JM |
258 | { |
259 | os_time_t usec; | |
260 | ||
4342326f JM |
261 | update_time->sec = fetch_time->sec; |
262 | update_time->usec = fetch_time->usec; | |
263 | update_time->sec -= age_ms / 1000; | |
264 | usec = (age_ms % 1000) * 1000; | |
265 | if (update_time->usec < usec) { | |
266 | update_time->sec--; | |
267 | update_time->usec += 1000000; | |
268 | } | |
269 | update_time->usec -= usec; | |
270 | } | |
271 | ||
272 | ||
273 | static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src, | |
acb69cec | 274 | struct os_reltime *fetch_time) |
4342326f | 275 | { |
83922c2d JM |
276 | dst->flags = src->flags; |
277 | os_memcpy(dst->bssid, src->bssid, ETH_ALEN); | |
278 | dst->freq = src->freq; | |
279 | dst->beacon_int = src->beacon_int; | |
280 | dst->caps = src->caps; | |
281 | dst->qual = src->qual; | |
282 | dst->noise = src->noise; | |
283 | dst->level = src->level; | |
284 | dst->tsf = src->tsf; | |
285 | ||
4342326f | 286 | calculate_update_time(fetch_time, src->age, &dst->last_update); |
83922c2d JM |
287 | } |
288 | ||
289 | ||
018a309a JM |
290 | static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
291 | { | |
292 | struct wpa_ssid *ssid; | |
293 | ||
294 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
295 | if (ssid->ssid == NULL || ssid->ssid_len == 0) | |
296 | continue; | |
297 | if (ssid->ssid_len == bss->ssid_len && | |
298 | os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) | |
299 | return 1; | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | ||
a6b71f72 PS |
306 | static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
307 | { | |
308 | return bss == wpa_s->current_bss || | |
44177b69 JM |
309 | (!is_zero_ether_addr(bss->bssid) && |
310 | (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || | |
311 | os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0)); | |
a6b71f72 PS |
312 | } |
313 | ||
314 | ||
018a309a JM |
315 | static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) |
316 | { | |
317 | struct wpa_bss *bss; | |
318 | ||
319 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
320 | if (!wpa_bss_known(wpa_s, bss)) { | |
a6b71f72 | 321 | wpa_bss_remove(wpa_s, bss, __func__); |
018a309a JM |
322 | return 0; |
323 | } | |
324 | } | |
325 | ||
326 | return -1; | |
327 | } | |
328 | ||
329 | ||
a6b71f72 | 330 | static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) |
018a309a | 331 | { |
a6b71f72 PS |
332 | struct wpa_bss *bss; |
333 | ||
018a309a JM |
334 | /* |
335 | * Remove the oldest entry that does not match with any configured | |
336 | * network. | |
337 | */ | |
338 | if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) | |
a6b71f72 | 339 | return 0; |
018a309a JM |
340 | |
341 | /* | |
a6b71f72 | 342 | * Remove the oldest entry that isn't currently in use. |
018a309a | 343 | */ |
a6b71f72 PS |
344 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
345 | if (!wpa_bss_in_use(wpa_s, bss)) { | |
346 | wpa_bss_remove(wpa_s, bss, __func__); | |
347 | return 0; | |
348 | } | |
349 | } | |
350 | ||
351 | return -1; | |
018a309a JM |
352 | } |
353 | ||
354 | ||
a297201d JM |
355 | static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s, |
356 | const u8 *ssid, size_t ssid_len, | |
c5f10e80 | 357 | struct wpa_scan_res *res, |
acb69cec | 358 | struct os_reltime *fetch_time) |
83922c2d JM |
359 | { |
360 | struct wpa_bss *bss; | |
361 | ||
8c090654 | 362 | bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); |
83922c2d | 363 | if (bss == NULL) |
a297201d | 364 | return NULL; |
83922c2d JM |
365 | bss->id = wpa_s->bss_next_id++; |
366 | bss->last_update_idx = wpa_s->bss_update_idx; | |
c5f10e80 | 367 | wpa_bss_copy_res(bss, res, fetch_time); |
83922c2d JM |
368 | os_memcpy(bss->ssid, ssid, ssid_len); |
369 | bss->ssid_len = ssid_len; | |
370 | bss->ie_len = res->ie_len; | |
8c090654 JM |
371 | bss->beacon_ie_len = res->beacon_ie_len; |
372 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
c739d7e9 | 373 | wpa_bss_set_hessid(bss); |
83922c2d | 374 | |
a3cbf82e JM |
375 | if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count && |
376 | wpa_bss_remove_oldest(wpa_s) != 0) { | |
377 | wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d " | |
378 | "because all BSSes are in use. We should normally " | |
379 | "not get here!", (int) wpa_s->num_bss + 1); | |
380 | wpa_s->conf->bss_max_count = wpa_s->num_bss + 1; | |
381 | } | |
382 | ||
83922c2d | 383 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
d4bf8f13 | 384 | dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); |
83922c2d | 385 | wpa_s->num_bss++; |
f049052b BG |
386 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR |
387 | " SSID '%s'", | |
388 | bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len)); | |
f0d126d3 | 389 | wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); |
a297201d | 390 | return bss; |
83922c2d JM |
391 | } |
392 | ||
393 | ||
158c6c74 WS |
394 | static int are_ies_equal(const struct wpa_bss *old, |
395 | const struct wpa_scan_res *new, u32 ie) | |
396 | { | |
397 | const u8 *old_ie, *new_ie; | |
398 | struct wpabuf *old_ie_buff = NULL; | |
399 | struct wpabuf *new_ie_buff = NULL; | |
400 | int new_ie_len, old_ie_len, ret, is_multi; | |
401 | ||
402 | switch (ie) { | |
403 | case WPA_IE_VENDOR_TYPE: | |
404 | old_ie = wpa_bss_get_vendor_ie(old, ie); | |
405 | new_ie = wpa_scan_get_vendor_ie(new, ie); | |
406 | is_multi = 0; | |
407 | break; | |
408 | case WPS_IE_VENDOR_TYPE: | |
409 | old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); | |
410 | new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie); | |
411 | is_multi = 1; | |
412 | break; | |
413 | case WLAN_EID_RSN: | |
414 | case WLAN_EID_SUPP_RATES: | |
415 | case WLAN_EID_EXT_SUPP_RATES: | |
416 | old_ie = wpa_bss_get_ie(old, ie); | |
417 | new_ie = wpa_scan_get_ie(new, ie); | |
418 | is_multi = 0; | |
419 | break; | |
420 | default: | |
421 | wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | if (is_multi) { | |
426 | /* in case of multiple IEs stored in buffer */ | |
427 | old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; | |
428 | new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; | |
429 | old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; | |
430 | new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; | |
431 | } else { | |
432 | /* in case of single IE */ | |
433 | old_ie_len = old_ie ? old_ie[1] + 2 : 0; | |
434 | new_ie_len = new_ie ? new_ie[1] + 2 : 0; | |
435 | } | |
436 | ||
f4fbba8c JM |
437 | if (!old_ie || !new_ie) |
438 | ret = !old_ie && !new_ie; | |
439 | else | |
440 | ret = (old_ie_len == new_ie_len && | |
441 | os_memcmp(old_ie, new_ie, old_ie_len) == 0); | |
158c6c74 WS |
442 | |
443 | wpabuf_free(old_ie_buff); | |
444 | wpabuf_free(new_ie_buff); | |
445 | ||
446 | return ret; | |
447 | } | |
448 | ||
449 | ||
450 | static u32 wpa_bss_compare_res(const struct wpa_bss *old, | |
451 | const struct wpa_scan_res *new) | |
452 | { | |
453 | u32 changes = 0; | |
454 | int caps_diff = old->caps ^ new->caps; | |
455 | ||
456 | if (old->freq != new->freq) | |
457 | changes |= WPA_BSS_FREQ_CHANGED_FLAG; | |
458 | ||
459 | if (old->level != new->level) | |
460 | changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; | |
461 | ||
462 | if (caps_diff & IEEE80211_CAP_PRIVACY) | |
463 | changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; | |
464 | ||
465 | if (caps_diff & IEEE80211_CAP_IBSS) | |
466 | changes |= WPA_BSS_MODE_CHANGED_FLAG; | |
467 | ||
7899e2f4 WS |
468 | if (old->ie_len == new->ie_len && |
469 | os_memcmp(old + 1, new + 1, old->ie_len) == 0) | |
470 | return changes; | |
471 | changes |= WPA_BSS_IES_CHANGED_FLAG; | |
472 | ||
158c6c74 WS |
473 | if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE)) |
474 | changes |= WPA_BSS_WPAIE_CHANGED_FLAG; | |
475 | ||
476 | if (!are_ies_equal(old, new, WLAN_EID_RSN)) | |
477 | changes |= WPA_BSS_RSNIE_CHANGED_FLAG; | |
478 | ||
479 | if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE)) | |
480 | changes |= WPA_BSS_WPS_CHANGED_FLAG; | |
481 | ||
482 | if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) || | |
483 | !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES)) | |
484 | changes |= WPA_BSS_RATES_CHANGED_FLAG; | |
485 | ||
486 | return changes; | |
487 | } | |
488 | ||
489 | ||
490 | static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, | |
491 | const struct wpa_bss *bss) | |
492 | { | |
493 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) | |
494 | wpas_notify_bss_freq_changed(wpa_s, bss->id); | |
495 | ||
496 | if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) | |
497 | wpas_notify_bss_signal_changed(wpa_s, bss->id); | |
498 | ||
499 | if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) | |
500 | wpas_notify_bss_privacy_changed(wpa_s, bss->id); | |
501 | ||
502 | if (changes & WPA_BSS_MODE_CHANGED_FLAG) | |
503 | wpas_notify_bss_mode_changed(wpa_s, bss->id); | |
504 | ||
505 | if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) | |
506 | wpas_notify_bss_wpaie_changed(wpa_s, bss->id); | |
507 | ||
508 | if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) | |
509 | wpas_notify_bss_rsnie_changed(wpa_s, bss->id); | |
510 | ||
511 | if (changes & WPA_BSS_WPS_CHANGED_FLAG) | |
512 | wpas_notify_bss_wps_changed(wpa_s, bss->id); | |
513 | ||
7899e2f4 WS |
514 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
515 | wpas_notify_bss_ies_changed(wpa_s, bss->id); | |
516 | ||
158c6c74 WS |
517 | if (changes & WPA_BSS_RATES_CHANGED_FLAG) |
518 | wpas_notify_bss_rates_changed(wpa_s, bss->id); | |
3bd3257a DW |
519 | |
520 | wpas_notify_bss_seen(wpa_s, bss->id); | |
158c6c74 WS |
521 | } |
522 | ||
523 | ||
762b99db JM |
524 | static struct wpa_bss * |
525 | wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, | |
acb69cec | 526 | struct wpa_scan_res *res, struct os_reltime *fetch_time) |
83922c2d | 527 | { |
158c6c74 WS |
528 | u32 changes; |
529 | ||
530 | changes = wpa_bss_compare_res(bss, res); | |
83922c2d JM |
531 | bss->scan_miss_count = 0; |
532 | bss->last_update_idx = wpa_s->bss_update_idx; | |
c5f10e80 | 533 | wpa_bss_copy_res(bss, res, fetch_time); |
83922c2d JM |
534 | /* Move the entry to the end of the list */ |
535 | dl_list_del(&bss->list); | |
ff57398f JM |
536 | #ifdef CONFIG_P2P |
537 | if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) && | |
538 | !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) { | |
539 | /* | |
540 | * This can happen when non-P2P station interface runs a scan | |
541 | * without P2P IE in the Probe Request frame. P2P GO would reply | |
542 | * to that with a Probe Response that does not include P2P IE. | |
543 | * Do not update the IEs in this BSS entry to avoid such loss of | |
544 | * information that may be needed for P2P operations to | |
545 | * determine group information. | |
546 | */ | |
547 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for " | |
548 | MACSTR " since that would remove P2P IE information", | |
549 | MAC2STR(bss->bssid)); | |
550 | } else | |
551 | #endif /* CONFIG_P2P */ | |
8c090654 JM |
552 | if (bss->ie_len + bss->beacon_ie_len >= |
553 | res->ie_len + res->beacon_ie_len) { | |
554 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
83922c2d | 555 | bss->ie_len = res->ie_len; |
8c090654 | 556 | bss->beacon_ie_len = res->beacon_ie_len; |
83922c2d JM |
557 | } else { |
558 | struct wpa_bss *nbss; | |
1c83b67e JM |
559 | struct dl_list *prev = bss->list_id.prev; |
560 | dl_list_del(&bss->list_id); | |
8c090654 JM |
561 | nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + |
562 | res->beacon_ie_len); | |
83922c2d | 563 | if (nbss) { |
762b99db JM |
564 | unsigned int i; |
565 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
566 | if (wpa_s->last_scan_res[i] == bss) { | |
567 | wpa_s->last_scan_res[i] = nbss; | |
568 | break; | |
569 | } | |
570 | } | |
eb37e085 EP |
571 | if (wpa_s->current_bss == bss) |
572 | wpa_s->current_bss = nbss; | |
a7f5271d | 573 | wpa_bss_update_pending_connect(wpa_s, bss, nbss); |
83922c2d | 574 | bss = nbss; |
8c090654 JM |
575 | os_memcpy(bss + 1, res + 1, |
576 | res->ie_len + res->beacon_ie_len); | |
83922c2d | 577 | bss->ie_len = res->ie_len; |
8c090654 | 578 | bss->beacon_ie_len = res->beacon_ie_len; |
83922c2d | 579 | } |
1c83b67e | 580 | dl_list_add(prev, &bss->list_id); |
83922c2d | 581 | } |
c739d7e9 JM |
582 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
583 | wpa_bss_set_hessid(bss); | |
83922c2d | 584 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
158c6c74 WS |
585 | |
586 | notify_bss_changes(wpa_s, changes, bss); | |
762b99db JM |
587 | |
588 | return bss; | |
83922c2d JM |
589 | } |
590 | ||
591 | ||
2c09af30 JM |
592 | /** |
593 | * wpa_bss_update_start - Start a BSS table update from scan results | |
594 | * @wpa_s: Pointer to wpa_supplicant data | |
595 | * | |
596 | * This function is called at the start of each BSS table update round for new | |
597 | * scan results. The actual scan result entries are indicated with calls to | |
598 | * wpa_bss_update_scan_res() and the update round is finished with a call to | |
599 | * wpa_bss_update_end(). | |
600 | */ | |
83922c2d JM |
601 | void wpa_bss_update_start(struct wpa_supplicant *wpa_s) |
602 | { | |
603 | wpa_s->bss_update_idx++; | |
f049052b BG |
604 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", |
605 | wpa_s->bss_update_idx); | |
a297201d | 606 | wpa_s->last_scan_res_used = 0; |
83922c2d JM |
607 | } |
608 | ||
609 | ||
2c09af30 JM |
610 | /** |
611 | * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result | |
612 | * @wpa_s: Pointer to wpa_supplicant data | |
613 | * @res: Scan result | |
c5f10e80 | 614 | * @fetch_time: Time when the result was fetched from the driver |
2c09af30 JM |
615 | * |
616 | * This function updates a BSS table entry (or adds one) based on a scan result. | |
617 | * This is called separately for each scan result between the calls to | |
618 | * wpa_bss_update_start() and wpa_bss_update_end(). | |
619 | */ | |
83922c2d | 620 | void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, |
c5f10e80 | 621 | struct wpa_scan_res *res, |
acb69cec | 622 | struct os_reltime *fetch_time) |
83922c2d | 623 | { |
d73b3f2e | 624 | const u8 *ssid, *p2p, *mesh; |
83922c2d JM |
625 | struct wpa_bss *bss; |
626 | ||
4342326f | 627 | if (wpa_s->conf->ignore_old_scan_res) { |
acb69cec | 628 | struct os_reltime update; |
4342326f | 629 | calculate_update_time(fetch_time, res->age, &update); |
acb69cec JB |
630 | if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) { |
631 | struct os_reltime age; | |
632 | os_reltime_sub(&wpa_s->scan_trigger_time, &update, | |
633 | &age); | |
4342326f JM |
634 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS " |
635 | "table entry that is %u.%06u seconds older " | |
636 | "than our scan trigger", | |
637 | (unsigned int) age.sec, | |
638 | (unsigned int) age.usec); | |
639 | return; | |
640 | } | |
641 | } | |
642 | ||
83922c2d JM |
643 | ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); |
644 | if (ssid == NULL) { | |
f049052b BG |
645 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " |
646 | MACSTR, MAC2STR(res->bssid)); | |
83922c2d JM |
647 | return; |
648 | } | |
649 | if (ssid[1] > 32) { | |
f049052b BG |
650 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " |
651 | MACSTR, MAC2STR(res->bssid)); | |
83922c2d JM |
652 | return; |
653 | } | |
654 | ||
0c6b310e | 655 | p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); |
c772ef43 NKG |
656 | #ifdef CONFIG_P2P |
657 | if (p2p == NULL && | |
658 | wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) { | |
659 | /* | |
660 | * If it's a P2P specific interface, then don't update | |
661 | * the scan result without a P2P IE. | |
662 | */ | |
663 | wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR | |
664 | " update for P2P interface", MAC2STR(res->bssid)); | |
665 | return; | |
666 | } | |
667 | #endif /* CONFIG_P2P */ | |
0c6b310e JM |
668 | if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && |
669 | os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) | |
670 | return; /* Skip P2P listen discovery results here */ | |
671 | ||
83922c2d JM |
672 | /* TODO: add option for ignoring BSSes we are not interested in |
673 | * (to save memory) */ | |
d73b3f2e JA |
674 | |
675 | mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID); | |
676 | if (mesh && mesh[1] <= 32) | |
677 | ssid = mesh; | |
678 | ||
83922c2d JM |
679 | bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); |
680 | if (bss == NULL) | |
c5f10e80 | 681 | bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time); |
25b65a14 | 682 | else { |
c5f10e80 | 683 | bss = wpa_bss_update(wpa_s, bss, res, fetch_time); |
25b65a14 JM |
684 | if (wpa_s->last_scan_res) { |
685 | unsigned int i; | |
686 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { | |
687 | if (bss == wpa_s->last_scan_res[i]) { | |
688 | /* Already in the list */ | |
689 | return; | |
690 | } | |
691 | } | |
692 | } | |
693 | } | |
a297201d JM |
694 | |
695 | if (bss == NULL) | |
696 | return; | |
697 | if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) { | |
698 | struct wpa_bss **n; | |
699 | unsigned int siz; | |
700 | if (wpa_s->last_scan_res_size == 0) | |
701 | siz = 32; | |
702 | else | |
703 | siz = wpa_s->last_scan_res_size * 2; | |
704 | n = os_realloc_array(wpa_s->last_scan_res, siz, | |
705 | sizeof(struct wpa_bss *)); | |
706 | if (n == NULL) | |
707 | return; | |
708 | wpa_s->last_scan_res = n; | |
709 | wpa_s->last_scan_res_size = siz; | |
710 | } | |
711 | ||
ece88f76 JM |
712 | if (wpa_s->last_scan_res) |
713 | wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss; | |
83922c2d JM |
714 | } |
715 | ||
716 | ||
8d923a4a JM |
717 | static int wpa_bss_included_in_scan(const struct wpa_bss *bss, |
718 | const struct scan_info *info) | |
719 | { | |
720 | int found; | |
721 | size_t i; | |
722 | ||
723 | if (info == NULL) | |
724 | return 1; | |
725 | ||
726 | if (info->num_freqs) { | |
727 | found = 0; | |
728 | for (i = 0; i < info->num_freqs; i++) { | |
729 | if (bss->freq == info->freqs[i]) { | |
730 | found = 1; | |
731 | break; | |
732 | } | |
733 | } | |
734 | if (!found) | |
735 | return 0; | |
736 | } | |
737 | ||
738 | if (info->num_ssids) { | |
739 | found = 0; | |
740 | for (i = 0; i < info->num_ssids; i++) { | |
741 | const struct wpa_driver_scan_ssid *s = &info->ssids[i]; | |
742 | if ((s->ssid == NULL || s->ssid_len == 0) || | |
743 | (s->ssid_len == bss->ssid_len && | |
744 | os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == | |
745 | 0)) { | |
746 | found = 1; | |
747 | break; | |
748 | } | |
749 | } | |
750 | if (!found) | |
751 | return 0; | |
752 | } | |
753 | ||
754 | return 1; | |
755 | } | |
756 | ||
757 | ||
2c09af30 JM |
758 | /** |
759 | * wpa_bss_update_end - End a BSS table update from scan results | |
760 | * @wpa_s: Pointer to wpa_supplicant data | |
761 | * @info: Information about scan parameters | |
762 | * @new_scan: Whether this update round was based on a new scan | |
763 | * | |
764 | * This function is called at the end of each BSS table update round for new | |
765 | * scan results. The start of the update was indicated with a call to | |
766 | * wpa_bss_update_start(). | |
767 | */ | |
8d923a4a JM |
768 | void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, |
769 | int new_scan) | |
83922c2d JM |
770 | { |
771 | struct wpa_bss *bss, *n; | |
772 | ||
a12d3454 | 773 | os_get_reltime(&wpa_s->last_scan); |
8d923a4a JM |
774 | if (!new_scan) |
775 | return; /* do not expire entries without new scan */ | |
83922c2d JM |
776 | |
777 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
7d7d57b2 JM |
778 | if (wpa_bss_in_use(wpa_s, bss)) |
779 | continue; | |
8d923a4a JM |
780 | if (!wpa_bss_included_in_scan(bss, info)) |
781 | continue; /* expire only BSSes that were scanned */ | |
83922c2d JM |
782 | if (bss->last_update_idx < wpa_s->bss_update_idx) |
783 | bss->scan_miss_count++; | |
78633c37 SL |
784 | if (bss->scan_miss_count >= |
785 | wpa_s->conf->bss_expiration_scan_count) { | |
a6b71f72 | 786 | wpa_bss_remove(wpa_s, bss, "no match in scan"); |
83922c2d JM |
787 | } |
788 | } | |
a297201d | 789 | |
69278f73 JM |
790 | wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u", |
791 | wpa_s->last_scan_res_used, wpa_s->last_scan_res_size); | |
83922c2d JM |
792 | } |
793 | ||
794 | ||
2c09af30 JM |
795 | /** |
796 | * wpa_bss_flush_by_age - Flush old BSS entries | |
797 | * @wpa_s: Pointer to wpa_supplicant data | |
798 | * @age: Maximum entry age in seconds | |
799 | * | |
800 | * Remove BSS entries that have not been updated during the last @age seconds. | |
801 | */ | |
2b65b30d | 802 | void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) |
83922c2d | 803 | { |
83922c2d | 804 | struct wpa_bss *bss, *n; |
acb69cec | 805 | struct os_reltime t; |
83922c2d JM |
806 | |
807 | if (dl_list_empty(&wpa_s->bss)) | |
808 | return; | |
809 | ||
acb69cec | 810 | os_get_reltime(&t); |
2b65b30d | 811 | t.sec -= age; |
83922c2d JM |
812 | |
813 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
7d7d57b2 JM |
814 | if (wpa_bss_in_use(wpa_s, bss)) |
815 | continue; | |
83922c2d | 816 | |
acb69cec | 817 | if (os_reltime_before(&bss->last_update, &t)) { |
a6b71f72 | 818 | wpa_bss_remove(wpa_s, bss, __func__); |
83922c2d JM |
819 | } else |
820 | break; | |
821 | } | |
2b65b30d SL |
822 | } |
823 | ||
824 | ||
825 | static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx) | |
826 | { | |
827 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
828 | ||
78633c37 | 829 | wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age); |
83922c2d JM |
830 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
831 | wpa_bss_timeout, wpa_s, NULL); | |
832 | } | |
833 | ||
834 | ||
2c09af30 JM |
835 | /** |
836 | * wpa_bss_init - Initialize BSS table | |
837 | * @wpa_s: Pointer to wpa_supplicant data | |
838 | * Returns: 0 on success, -1 on failure | |
839 | * | |
840 | * This prepares BSS table lists and timer for periodic updates. The BSS table | |
841 | * is deinitialized with wpa_bss_deinit() once not needed anymore. | |
842 | */ | |
83922c2d JM |
843 | int wpa_bss_init(struct wpa_supplicant *wpa_s) |
844 | { | |
845 | dl_list_init(&wpa_s->bss); | |
d4bf8f13 | 846 | dl_list_init(&wpa_s->bss_id); |
83922c2d JM |
847 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
848 | wpa_bss_timeout, wpa_s, NULL); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | ||
2c09af30 JM |
853 | /** |
854 | * wpa_bss_flush - Flush all unused BSS entries | |
855 | * @wpa_s: Pointer to wpa_supplicant data | |
856 | */ | |
2b65b30d | 857 | void wpa_bss_flush(struct wpa_supplicant *wpa_s) |
83922c2d JM |
858 | { |
859 | struct wpa_bss *bss, *n; | |
2b65b30d | 860 | |
949938aa JM |
861 | wpa_s->clear_driver_scan_cache = 1; |
862 | ||
e5fc8c8c JM |
863 | if (wpa_s->bss.next == NULL) |
864 | return; /* BSS table not yet initialized */ | |
2b65b30d SL |
865 | |
866 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
867 | if (wpa_bss_in_use(wpa_s, bss)) | |
868 | continue; | |
a6b71f72 | 869 | wpa_bss_remove(wpa_s, bss, __func__); |
2b65b30d SL |
870 | } |
871 | } | |
872 | ||
873 | ||
2c09af30 JM |
874 | /** |
875 | * wpa_bss_deinit - Deinitialize BSS table | |
876 | * @wpa_s: Pointer to wpa_supplicant data | |
877 | */ | |
2b65b30d SL |
878 | void wpa_bss_deinit(struct wpa_supplicant *wpa_s) |
879 | { | |
880 | eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL); | |
881 | wpa_bss_flush(wpa_s); | |
83922c2d | 882 | } |
d4bf8f13 JM |
883 | |
884 | ||
2c09af30 JM |
885 | /** |
886 | * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID | |
887 | * @wpa_s: Pointer to wpa_supplicant data | |
888 | * @bssid: BSSID | |
889 | * Returns: Pointer to the BSS entry or %NULL if not found | |
890 | */ | |
d4bf8f13 JM |
891 | struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, |
892 | const u8 *bssid) | |
893 | { | |
894 | struct wpa_bss *bss; | |
d445a5cd JM |
895 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
896 | return NULL; | |
bc839782 | 897 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
d4bf8f13 JM |
898 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) |
899 | return bss; | |
900 | } | |
901 | return NULL; | |
902 | } | |
903 | ||
904 | ||
702621e6 JM |
905 | /** |
906 | * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID | |
907 | * @wpa_s: Pointer to wpa_supplicant data | |
908 | * @bssid: BSSID | |
909 | * Returns: Pointer to the BSS entry or %NULL if not found | |
910 | * | |
911 | * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to | |
912 | * find the entry that has the most recent update. This can help in finding the | |
913 | * correct entry in cases where the SSID of the AP may have changed recently | |
914 | * (e.g., in WPS reconfiguration cases). | |
915 | */ | |
916 | struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s, | |
917 | const u8 *bssid) | |
918 | { | |
919 | struct wpa_bss *bss, *found = NULL; | |
920 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) | |
921 | return NULL; | |
922 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { | |
923 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0) | |
924 | continue; | |
925 | if (found == NULL || | |
acb69cec | 926 | os_reltime_before(&found->last_update, &bss->last_update)) |
702621e6 JM |
927 | found = bss; |
928 | } | |
929 | return found; | |
930 | } | |
931 | ||
932 | ||
0a70f34f | 933 | #ifdef CONFIG_P2P |
2c09af30 JM |
934 | /** |
935 | * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr | |
936 | * @wpa_s: Pointer to wpa_supplicant data | |
937 | * @dev_addr: P2P Device Address of the GO | |
938 | * Returns: Pointer to the BSS entry or %NULL if not found | |
939 | */ | |
0a70f34f JM |
940 | struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, |
941 | const u8 *dev_addr) | |
942 | { | |
943 | struct wpa_bss *bss; | |
944 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { | |
945 | u8 addr[ETH_ALEN]; | |
946 | if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len, | |
947 | addr) == 0 && | |
948 | os_memcmp(addr, dev_addr, ETH_ALEN) == 0) | |
949 | return bss; | |
950 | } | |
951 | return NULL; | |
952 | } | |
953 | #endif /* CONFIG_P2P */ | |
954 | ||
955 | ||
2c09af30 JM |
956 | /** |
957 | * wpa_bss_get_id - Fetch a BSS table entry based on identifier | |
958 | * @wpa_s: Pointer to wpa_supplicant data | |
959 | * @id: Unique identifier (struct wpa_bss::id) assigned for the entry | |
960 | * Returns: Pointer to the BSS entry or %NULL if not found | |
961 | */ | |
d4bf8f13 JM |
962 | struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) |
963 | { | |
964 | struct wpa_bss *bss; | |
965 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
966 | if (bss->id == id) | |
967 | return bss; | |
968 | } | |
969 | return NULL; | |
970 | } | |
971 | ||
972 | ||
9f42d49c AS |
973 | /** |
974 | * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range | |
975 | * @wpa_s: Pointer to wpa_supplicant data | |
976 | * @idf: Smallest allowed identifier assigned for the entry | |
977 | * @idf: Largest allowed identifier assigned for the entry | |
978 | * Returns: Pointer to the BSS entry or %NULL if not found | |
979 | * | |
980 | * This function is similar to wpa_bss_get_id() but allows a BSS entry with the | |
981 | * smallest id value to be fetched within the specified range without the | |
982 | * caller having to know the exact id. | |
983 | */ | |
984 | struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s, | |
985 | unsigned int idf, unsigned int idl) | |
986 | { | |
987 | struct wpa_bss *bss; | |
988 | dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) { | |
989 | if (bss->id >= idf && bss->id <= idl) | |
990 | return bss; | |
991 | } | |
992 | return NULL; | |
993 | } | |
994 | ||
995 | ||
2c09af30 JM |
996 | /** |
997 | * wpa_bss_get_ie - Fetch a specified information element from a BSS entry | |
998 | * @bss: BSS table entry | |
999 | * @ie: Information element identitifier (WLAN_EID_*) | |
1000 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1001 | * | |
1002 | * This function returns the first matching information element in the BSS | |
1003 | * entry. | |
1004 | */ | |
d4bf8f13 JM |
1005 | const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) |
1006 | { | |
1007 | const u8 *end, *pos; | |
1008 | ||
1009 | pos = (const u8 *) (bss + 1); | |
1010 | end = pos + bss->ie_len; | |
1011 | ||
1012 | while (pos + 1 < end) { | |
1013 | if (pos + 2 + pos[1] > end) | |
1014 | break; | |
1015 | if (pos[0] == ie) | |
1016 | return pos; | |
1017 | pos += 2 + pos[1]; | |
1018 | } | |
1019 | ||
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | ||
2c09af30 JM |
1024 | /** |
1025 | * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry | |
1026 | * @bss: BSS table entry | |
1027 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1028 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1029 | * | |
1030 | * This function returns the first matching information element in the BSS | |
1031 | * entry. | |
1032 | */ | |
d4bf8f13 JM |
1033 | const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) |
1034 | { | |
1035 | const u8 *end, *pos; | |
1036 | ||
1037 | pos = (const u8 *) (bss + 1); | |
1038 | end = pos + bss->ie_len; | |
1039 | ||
1040 | while (pos + 1 < end) { | |
1041 | if (pos + 2 + pos[1] > end) | |
1042 | break; | |
1043 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1044 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1045 | return pos; | |
1046 | pos += 2 + pos[1]; | |
1047 | } | |
1048 | ||
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | ||
bb50ae43 JM |
1053 | /** |
1054 | * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry | |
1055 | * @bss: BSS table entry | |
1056 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1057 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1058 | * | |
1059 | * This function returns the first matching information element in the BSS | |
1060 | * entry. | |
1061 | * | |
1062 | * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only | |
1063 | * from Beacon frames instead of either Beacon or Probe Response frames. | |
1064 | */ | |
1065 | const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss, | |
1066 | u32 vendor_type) | |
1067 | { | |
1068 | const u8 *end, *pos; | |
1069 | ||
1070 | if (bss->beacon_ie_len == 0) | |
1071 | return NULL; | |
1072 | ||
1073 | pos = (const u8 *) (bss + 1); | |
1074 | pos += bss->ie_len; | |
1075 | end = pos + bss->beacon_ie_len; | |
1076 | ||
1077 | while (pos + 1 < end) { | |
1078 | if (pos + 2 + pos[1] > end) | |
1079 | break; | |
1080 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1081 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1082 | return pos; | |
1083 | pos += 2 + pos[1]; | |
1084 | } | |
1085 | ||
1086 | return NULL; | |
1087 | } | |
1088 | ||
1089 | ||
2c09af30 JM |
1090 | /** |
1091 | * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry | |
1092 | * @bss: BSS table entry | |
1093 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1094 | * Returns: Pointer to the information element payload or %NULL if not found | |
1095 | * | |
1096 | * This function returns concatenated payload of possibly fragmented vendor | |
1097 | * specific information elements in the BSS entry. The caller is responsible for | |
1098 | * freeing the returned buffer. | |
1099 | */ | |
d4bf8f13 JM |
1100 | struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, |
1101 | u32 vendor_type) | |
1102 | { | |
1103 | struct wpabuf *buf; | |
1104 | const u8 *end, *pos; | |
1105 | ||
1106 | buf = wpabuf_alloc(bss->ie_len); | |
1107 | if (buf == NULL) | |
1108 | return NULL; | |
1109 | ||
1110 | pos = (const u8 *) (bss + 1); | |
1111 | end = pos + bss->ie_len; | |
1112 | ||
cf8baca6 JM |
1113 | while (pos + 1 < end) { |
1114 | if (pos + 2 + pos[1] > end) | |
1115 | break; | |
1116 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1117 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1118 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1119 | pos += 2 + pos[1]; | |
1120 | } | |
1121 | ||
1122 | if (wpabuf_len(buf) == 0) { | |
1123 | wpabuf_free(buf); | |
1124 | buf = NULL; | |
1125 | } | |
1126 | ||
1127 | return buf; | |
1128 | } | |
1129 | ||
1130 | ||
2c09af30 JM |
1131 | /** |
1132 | * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry | |
1133 | * @bss: BSS table entry | |
1134 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1135 | * Returns: Pointer to the information element payload or %NULL if not found | |
1136 | * | |
1137 | * This function returns concatenated payload of possibly fragmented vendor | |
1138 | * specific information elements in the BSS entry. The caller is responsible for | |
1139 | * freeing the returned buffer. | |
1140 | * | |
1141 | * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only | |
1142 | * from Beacon frames instead of either Beacon or Probe Response frames. | |
1143 | */ | |
cf8baca6 JM |
1144 | struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss, |
1145 | u32 vendor_type) | |
1146 | { | |
1147 | struct wpabuf *buf; | |
1148 | const u8 *end, *pos; | |
1149 | ||
1150 | buf = wpabuf_alloc(bss->beacon_ie_len); | |
1151 | if (buf == NULL) | |
1152 | return NULL; | |
1153 | ||
1154 | pos = (const u8 *) (bss + 1); | |
1155 | pos += bss->ie_len; | |
1156 | end = pos + bss->beacon_ie_len; | |
1157 | ||
d4bf8f13 JM |
1158 | while (pos + 1 < end) { |
1159 | if (pos + 2 + pos[1] > end) | |
1160 | break; | |
1161 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1162 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1163 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1164 | pos += 2 + pos[1]; | |
1165 | } | |
1166 | ||
1167 | if (wpabuf_len(buf) == 0) { | |
1168 | wpabuf_free(buf); | |
1169 | buf = NULL; | |
1170 | } | |
1171 | ||
1172 | return buf; | |
1173 | } | |
99a6a63f JM |
1174 | |
1175 | ||
2c09af30 JM |
1176 | /** |
1177 | * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS | |
1178 | * @bss: BSS table entry | |
1179 | * Returns: Maximum legacy rate in units of 500 kbps | |
1180 | */ | |
99a6a63f JM |
1181 | int wpa_bss_get_max_rate(const struct wpa_bss *bss) |
1182 | { | |
1183 | int rate = 0; | |
1184 | const u8 *ie; | |
1185 | int i; | |
1186 | ||
1187 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
1188 | for (i = 0; ie && i < ie[1]; i++) { | |
1189 | if ((ie[i + 2] & 0x7f) > rate) | |
1190 | rate = ie[i + 2] & 0x7f; | |
1191 | } | |
1192 | ||
1193 | ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
1194 | for (i = 0; ie && i < ie[1]; i++) { | |
1195 | if ((ie[i + 2] & 0x7f) > rate) | |
1196 | rate = ie[i + 2] & 0x7f; | |
1197 | } | |
1198 | ||
1199 | return rate; | |
1200 | } | |
75d328af WS |
1201 | |
1202 | ||
2c09af30 JM |
1203 | /** |
1204 | * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS | |
1205 | * @bss: BSS table entry | |
1206 | * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps) | |
1207 | * Returns: number of legacy TX rates or -1 on failure | |
1208 | * | |
1209 | * The caller is responsible for freeing the returned buffer with os_free() in | |
1210 | * case of success. | |
1211 | */ | |
75d328af WS |
1212 | int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) |
1213 | { | |
1214 | const u8 *ie, *ie2; | |
20766f20 JM |
1215 | int i, j; |
1216 | unsigned int len; | |
1217 | u8 *r; | |
75d328af WS |
1218 | |
1219 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
1220 | ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
1221 | ||
1222 | len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); | |
1223 | ||
20766f20 JM |
1224 | r = os_malloc(len); |
1225 | if (!r) | |
75d328af WS |
1226 | return -1; |
1227 | ||
1228 | for (i = 0; ie && i < ie[1]; i++) | |
20766f20 | 1229 | r[i] = ie[i + 2] & 0x7f; |
75d328af WS |
1230 | |
1231 | for (j = 0; ie2 && j < ie2[1]; j++) | |
20766f20 | 1232 | r[i + j] = ie2[j + 2] & 0x7f; |
75d328af | 1233 | |
20766f20 | 1234 | *rates = r; |
75d328af WS |
1235 | return len; |
1236 | } |